Graphics Programs Reference
In-Depth Information
Figure 5.2 shows an ideal LFM pulse compression process. Part (a) shows
the envelope for a wide pulse, part (b) shows the frequency modulation (in this
case it is an upchirp LFM) with bandwidth . Part (c) shows the
matched filter time-delay characteristic, while part (d) shows the compressed
pulse envelope. Finally part (e) shows the Matched filter input / output wave-
forms.
Bf
2
=
f
1
(a)
τ'
f
2
f
1
f
1
(b)
∆
t
(c)
∆
t
1
f
1
f
2
τ
(d)
τ
τ'
Matched Filter
(e)
Figure 5.2 Ideal LFM pulse compression.
Fig. 5.3
illustrates the advantage of pulse compression using more realistic
LFM waveform. In this example, two targets with RCS and
are detected. The two targets are not separated enough in time to
be resolved. Fig. 5.3a shows the composite echo signal from those targets.
1
m
2
σ
1
=
0.5
m
2
σ
2
=
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